| What We Treat
Thumb Osteoarthritis
Struggling with jars, keys and pegs, with an aching, squared-off thumb base? Thumb base arthritis is extremely common — and responds far better to strengthening and simple adaptations than most people are told.
Overview
What Is Thumb Base Osteoarthritis?
The joint at the base of the thumb, where it meets the wrist, is a saddle-shaped joint that allows the thumb its remarkable range of movement. That mobility comes at the cost of stability, and the joint carries extremely high loads during pinch. Osteoarthritis here is one of the most common forms of hand arthritis, particularly in women from middle age onwards, and it has a significant impact on daily function because so many tasks depend on pinch grip.
The Thumb Base Joint
A saddle joint allowing the thumb to move in multiple planes and to oppose the fingers. Its mobility depends on ligaments rather than bony congruence, and load during pinch is many times the force applied at the fingertips — which explains the high rate of wear.
Symptoms
How It Tends to Feel
Thumb base arthritis has a consistent presentation centred on pinch tasks:
Pain at the Thumb Base
Localised aching at the base of the thumb where it meets the wrist, worse with use.
Difficulty With Pinch Tasks
Jars, keys, pegs, bottle tops, buttons and taps become progressively harder.
Weak Grip
Measurably reduced pinch and grip strength, often with things being dropped.
A Squared-Off Appearance
The base of the thumb becomes more prominent and angular over time.
Morning Stiffness
Stiffness first thing that eases within the first half hour of use.
Aching After Use
Symptoms building through a day of hand-intensive activity and easing overnight.
Causes & Risk Factors
What Drives It
A combination of joint mechanics, load history and hormonal factors.
Joint Mechanics
The saddle shape and ligamentous stability of the joint mean it experiences high shear forces during pinch.
Sex and Hormones
Substantially more common in women, with incidence rising markedly around and after the menopause.
Cumulative Load
Occupations and hobbies involving repeated forceful pinch are associated with earlier onset.
Joint Laxity
Increased ligamentous laxity allows more shear at the joint surface and is a recognised risk factor.
Previous Injury
A previous fracture or significant sprain at the thumb base increases the likelihood of later arthritis.
How We Can Help You
Treatment & Management
This is one of the areas where conservative management performs particularly well. Splinting, strengthening and simple adaptations produce meaningful improvements in both pain and function.
What the evidence says
Randomised trials of multimodal hand therapy — combining splinting, exercise and joint protection education — show meaningful improvements in pain and function for thumb base osteoarthritis, and this is recommended as first-line management before surgical options are considered.
NICE guidance on osteoarthritis identifies therapeutic exercise as a core treatment for all joints, and advises that osteoarthritis can usually be diagnosed clinically without imaging where the presentation is typical.
When to Seek Help
Red Flags — Don’t Ignore These
Thumb base arthritis is a benign condition. Seek assessment if you notice:
⚠ Seek prompt medical assessment if you notice:
- A hot, red, swollen joint with fever or feeling generally unwell (possible infection or gout — seek prompt assessment)
- Sudden severe swelling and pain in multiple joints, particularly with morning stiffness lasting over an hour (possible inflammatory arthritis)
- Tenderness at the base of the thumb after a fall (possible scaphoid fracture)
- Visible wasting of the fleshy pad at the base of the thumb (possible nerve compression)
- Rapidly worsening deformity or loss of function over weeks
These symptoms can point to a cause that needs medical rather than physiotherapy assessment. Please don’t wait for a physiotherapy appointment — contact your GP, call 111, or attend A&E as appropriate.
Common Questions
Frequently Asked Questions
Will it keep getting worse?
Not necessarily in terms of symptoms. Radiographic change tends to progress slowly, but pain often plateaus or even reduces as the joint stiffens. Many people reach a stable state where function is manageable with adaptations and strengthening.
Can exercise damage an arthritic joint?
No. This is one of the most persistent myths in musculoskeletal care. Appropriate strengthening improves pain and function in arthritic joints, and there’s no evidence it accelerates structural change. Weakness and avoidance make things worse, not better.
Should I have surgery?
Not as a first step. Multimodal hand therapy has good evidence and should be tried properly first. Trapeziectomy is a reasonable option for people with persistent, limiting pain despite that — it has good long-term outcomes but a lengthy recovery.
Would an injection help?
A corticosteroid injection can provide short-term relief, which some people find useful for getting through a particular period or engaging better with strengthening. The effect is usually temporary, so it works best as part of a plan.
Keep Your Hand Working
Targeted strengthening, the right splint, and practical adaptations that give you back the tasks arthritis has taken.
Book Your Initial AssessmentThis page is for general information only and isn’t a substitute for individual medical advice. If you’re experiencing any of the warning signs above, contact your GP or seek emergency medical care as appropriate.